A coeeobatioh  of majists



J. KIEWICZ.

BUTTONHOLE SEWING MACHINE.

APPLLCATION'-HLED JAN. 21 um.

Patented Dec. 30, 191%).

2 SHEETS-SHEET l.

Fig.1.

x .V////// m w & f.

1 3 aW an mm s ifflauhw a Wnesses.

J. KlEWlCZ.

' BUTTONHOLE SEWING MACHINE.

APPLICATlON man JAN. 2. 1915.

1 326,666 Patented Dec. 30,1919.

2 SHEETS-SHEET 2.

e 1. 58 '2 \a s Q Fig 5..

- H e 41 4 a Li 46 5Q 48 4 5E 62 44 4 s8 t. 5 v -60 Y I Witnesses.

ievvicg,

JOHN KIEVVFLUZ,

or nosr'on, MASSACHUSETTS, Assrsn'on To; 'rnn nnnon nnrron nrionrn'nGQMPANY, or nosron, nassacnnsn'rrs, A cosnonarion' or armBUTTONHOLE-SEWING MACHINE.

- eas es.

To all whom it may concern:

, Be 1t known that I, JoHN 'Kinwioz, a cltizen of the United States,residing at Boston,

turning movement to provide for stitching around the ends of abuttonhole, and the in vention has for its object to provide anov'e].

construction by which the .so-called"purlportion of the buttonholestitching-may be formed on the top, insteadof on the bottom, of thework. in stitching a buttonhole with a two-thread buttonhole sewingmachine the upper and under thread are intertwined or interlaced alongtwo separate lines, one line of interlacing coming on the upper or ex:-posed face of the material at a distance back from the edge of thematerial equal to the length of the depth stitch, and the other line ofinterlacing or so-called purl.usually be 'ing situated at the edge ofthe buttonhole 'slit in the material, only at the under side of I thematerial. There are some classes of work in which it is desirable .tohave the pur or interlacing of the upper and under threads thatissituated at the edge of the buttonhole, appear on'the top or exposedface of the material rather than on the un der. side thereof, and thiscan be accom-- plished by increasing the tension on the un-' movementnecessitates drawing out a length of the under thread to which the heavytension: is applied, and unless this is very carefully done, the underthread is likely to be broken due to the heavy tension thereon; I

have bymy invention provided means whereby the tension on the underthread may be relieved automatically at the end of the t tch ng p rat onon a b ttonh s id 1 propriate heavy tension may be given to the underthread to bring the purl o'n'the upper.

illustrated-in said patents with my improvewhich is formed by my improveSpecification of Letterslatent, ,Patgnteqi Deg; 3Q), 1919;, Applicationfiled January 2, 1915. Serial No. 24.

that during the stitching operation the apfaoe of the fabric and yetwhenthe stitching operation is completed and the work is to be shifted,the'tension is released, so that "the operator can bring the work into anew posie tion without danger of breaking the under; thread.My'invention is adaptable for use in connection with any buvttonholesewing machine in whichthe under thread mechanism has a bodily turningmovement ,to'permit it to stitch around the ends of the buttonhole,whether theturning movement, be a tension being again automaticallyapplied. to the under thread when the stitching oporation begins on thenext buttonhole, so

continuous one or be a vibratory. DQ6 1 1; have, however, herein chosento lllustrzntc my inventionit would be applied tota sewing machine of[the so called .lfltht fi 2 type, examples of whichare foundi'n' thcfollowing United States patents; No. 655,637, August 7, 1900;: No.684,046, October 8, 15901, No. 713,764, November 18, 190-2;

and in the drawings I have shown a clent portlon of the sewing machinesuch as ments applied thereto to give an understanding of the invention.

partly in section of the front portion of a buttonhole sewing machine otthe .Reece typ v Fig. 2 is a section on the line w-w, Fig. 1;

a Fig. 3 is a section on substantially the line g y Fig. 2;lookingupwardly; I Fig. 4 is a section on the line aa, Fig. 2;

Fig. 5 is a section on substantially the broken line bb, Fig. 4;.

Fig. 6 is a fragmentary perspective view of one edge of a buttonholeshowing the usual'concatenation of the threads formingthe stitches;

Fig. 7 is a similar view showin the stitch d device.

I have shown at l the base frame of a sewing machine on which is mounteda clamp frame 2 carrying clamp plates 3 and work-clamping members 4:,these work-olamping members 4 being pivotally mounted on arms 5 which inturn are pivoted at ,6 to the In the drawings, Figure 1 is aside view vso-called stitch frame Which carriesboth the upper and under threadmechanism. The upper thread mechanism is shown 1n the form of aneye-pointed needle 8 sustained in a reciprocating needle bar 9 operatingin ways in the head 10 of the stitch frame. The under thread mechanismis carried by a so-called stitch block 11 which is rotatably mounted inbearings 12 and 13 carried by the bracket or portion 14 of the stitchframe that depends below the clamp frame. This under thread mechanismcomprises a needle and looper and-other operative parts, ,such, forinstance, as are illustrated and described in the above-ii1entionedpatents, and as the present invention does not relate to the par--ticular construction of the under thread. mechanism I have not deemed itnecessary to further illustrate or describe it herein. Both the upperand under thread mechanism are capable of bodily turning movement abouta vertical axis to permit the stitching around the ends of a buttonhole,all as set forth in said above-mentioned patents, and this turningmovement is effected by means of two segment gears 140 and 15 mounted ona shaft 160 and meshing with gears 17 and 48 associated with the upperand under thread mechanism, respectively. The ten sion on theupperthread 16 is governed by a suitable tension device 170 of an a propriateconstruction. The tension on the lower thread 18 is controlled by atension device 19 of any suitable construction carried by the stitchblock 11 of the under thread mechanism. The under thread passes upthrough the hollow spindle 20 of the under thread mechanism and emergesfrom an aperture 21, thence passes around a guide pin 22 and through thetension de vice 19 and from thence to the needle and other operatinparts of the under stitch forming mechanism, all as usual in devices ofthis nature. The tension device 19 thus acts on the portion of the underthread be tween the axial thread passage through the hollow spindle 20and the needle. i

In the operation of a buttonhole sewing machine of this type it is usualto have 'the tension on the upper thread slightly greater than that onthe under thread, and when this condition exists the so-called purl ofthe buttonhole will be formed'on the underside of the material at theedge of the slit, as shown in Fig. 6, wherein the upper thread 16 whichis carried throughthe material' back fromthe edge ofthe buttonhole isinterlaced with the lowerthread 18 which passes up through the slit atpoints 23, the latter constituting the so-called purl of the buttonhole.In some classes of'work it is desirable that this purl or points where ithe two threads interlace should appear, on the top edge of the fabric,and this end can be accomplished by making the tension on i thelowerthread 18greater than that on the upper thread, such increased tensioncausing the points 23 of the interlacing to be drawn around through thebuttonhole so that they appear on the top edge thereof, as shown in Fig.7Q However, as stated above, there are disadvantages which arise whenthe un der thread is subject continuously. to aheavy tension because thesevere tension on the under thread interferes with the rapid shifting ofthe material at the completion of'a buttonhole into a position forstitching the next buttonholel Thisis because when the material is thusshifted it is necessary to draw out alength of the upper and underthread equal to the distance between the buttonholes, and where theunder thread is subjected to a heavy tension, this operation is likelytocause breakage of the under thread unless extreme care is used. I haveprovided herein means for relieving the tension on the under threadautomatically when the'stitching operation on one buttonhole iscompleted, and for automatically applying the tension to the underthread when the stitching on the next succeeding buttonhole is begun.This permits the under thread to be drawn out freely as'the material isshifted-to place it in positionv to have a fresh buttonhole stitched.

\Vhile any suitable means for thus relieving automaticallyandre'e'stablishing again the tension on the under thread may "beemployed, I have herein illustrated a device which operates inconnection with the work clamp so that the operation of clamping thework in position causes the tension on the under thread to be applied,while the operation of unclamping the work causes the tension to bereleased. It is not essential to the invention, however, that thisrelieving of the tension and applying it again should be done inconjunction with the clamping and unclamping of the work. The arms 5carrying the 'work clamps i are provided with the usualforwardly-extending portions 25 provided with hooks 26 at their forwardends which einbrace a lip 27 carried by a swinging yoke-shaped member 29that ispivoted to the clamp frame 2 at This yoke-shaped member 29 isprovided with a dependii g portion 31 to which is pivoted at 32 an elow-lever 33, one arm of this lever being pivotally connected at 34c toan arm 35 on a clanip operating lever 36 that in turn is pivoted'at 37to the clamp frame 2. The arm 35 and the lever 33 constitute a togglejoint which when straightened operates through the extension 31 to swingthe frame or yoke-shaped member 29 downwardly, the latter operatingthrough thelip 27 and hook-shaped portion 26 to swing the clamp-carryingarms 5 downwardly, thus bring the clamps 4: against the work, The lever3t} constitutes means by which the clamps 4 may be brought intooperative, position by hand. The clamps are automatically operated bymeans of alever, one end of which is shown at 38' and which is actuatedby a cam, all as illustrated in PatentNo. 713,764. The clamp isautomatically released at the end of the stitching operation by breakingthe toggle lever 33, 35, as also described in said patam. Thisclamp-operating-means forms no part of my present invention and,therefore,

need not be further described asjany -fur-.-

, ther desirable description will be found in 40 and 41 between whichthe thread is confined, the disk 41 being yieldingly held in frictionalengagement with the thread by a spring 42, the tension of which isregulated by the adjusting nut 43. In the illustrated embodiment 'of my,invention the tension on the under thread is released by atensionreleasing device in the form of a pin 44 which extends throughthe hub 45 of the gear 48, said hub, it bein noted, having a lengthsuh'icient, to eXten up-through the bearing 12 and being secured to thestitch block 11 by means of a pin"46 which ex tends through the hub intothev stitch block. This tension-releasin pin 44 is bent later ally atits upper en 'as shown at 49, and

then upwardly, asshown at 50, the upper end being tapered orwedge-shaped and in position to enter between thetension disks 40, 41 onthe side thereof at which the under thread 18 enters and leaves thetension member.

This tension-releasing pin extends through the gear 48 and terminatesbelow the gear. \Vith this construction it will be noted that theraising of the pin 44 will force the disks 40, 41 apart, thus relievingthe tension on the under thread, while when the pin occu pies theposition shown in Figs. 2"and'5 the under thread will be subjected tothe full tension. For thus raising the pin 44 to relieve the tension, Ihave-provided a member 51 in the form'of an arm or lever which ispivoted at one end, as at 52, to the portion 14 of thestitchframe, andat the other end is provided with an eye 54 through which extends a rod55 that is secured at its upper end to one of the arms 29. As hereinshown this rod 55 has a nut or collar 56 on its lower end against whichthe eye 54 of the arm 51 rests, and at its upper end it extends throughan ear or arm 58 secured to the member 29 and is pro vided with a head57 which rests on this ear or arm. 59 is a sprin which encircles the rodand yieldingly hol s the member 51 against the nut 56. The member 51 isprovided intermediate of its ends with the pinengaging portion 60 whichpartially encircles the usual sleeve nuttil that is screwed on the stem62 of the stitch block 11 and which holds' the gear 48 in position,as'seen in Fig. 5, this nut 61 being commonly used in this type ofsewing machine. The pinengaging portion 60 is situated directly beneaththe pin 44 and is concentric with the axis about which the under threadmecha'-.

nism rotates, so that as the under thread mechanism 'rotates the pin 44will 'move aronnd'directly over said portion 60. With this constructionit I will be observed that when the arms 29 are raised the member 51will be turned about its pivot and the pmengaging portion 60 thereofwill raise the pin 44 thereby to release the tension on the underthread. p

In the operation of the sewing machine the act of clamping the work inPOSltIOII' causes the -frame 29 to swing downwardly.

about its pivot, this downward movement swinging the member 51downwardly out of engagement with the pin 44 whereby said pin isrendered inoperative and the under thread 18 is subjected to the fulltension applied to it by the tension' device 19. After the work is thusclamped the stitching operation is automatically carried on, all asdescribed in the above-mentioned patents, andduring this operation theupper and under thread mechanisms are given a rotary or turning movementabout their vertical axes to carry the stitching around the ends of thebuttonhole. \Vhen the stitching operation is completed the work clamp is"automatically released, all as described in the above-mentionedpatents, and when this occurs the releasing of the clamp causes theframe 29 to I move upwardly into the position shown in Fig. 1. This,upward movement of the part 29 carries the member 51 upwardly, thusbringing the'pin-engaging portion 6Q into engagement with thetension-releasing pin 44 and elevating the latter thereby to force itbetween the disks 40 and 41 of the tension device and crowd them apart.This results in removing the tension on the lower thread so thatit canbe drawn out readily without undue strain. The tension will be heldreleased until the Work is clamped again ready for stitching the nextbuttonhole when the operation of clamping the .work will cause thetension to beapplied.

will be noted that the under thread mechanism rotates or turns about avertical axis and that the releasing pin 44 has a bodily movement withit. The shape and construction of the pin-engaging portion 60 of the arm51 is such as to permit this turn ing movement of the under threadmechanism without interfering with the operation of the machine, for solong as the pin is over any part of the curved pin-engaging portion 60the raising of the member 51 will release the tension.

In sewing machines of the type herein illustrateththe stitch frame 7 andclamp frame 2 are so positioned relative to each other when the machineis at'rest that the.

work retained in the work clamp will be in position to have thebuttonhole cut, and when the machine is started, said frames have firsta relative movement to bring them from buttonhole-cutting to stitchingposition. \Vhen the parts have been moved into stitching position. thestitching operation begins and the stitch frame and clamp frame have acontinued relative movement as the stitches are formed down one side ofthe buttonhole and then back along the other side of the buttonhole.When the stitching on' the buttonhole is completed, the stitchingmechanism is brou ht to rest and said stitch frame and clamp frame havestill a further relative movement to carry the parts from stitching tobuttonhole-cutting positions It will be noted that the tension-releasingdevice herein shown is connected both to the portion 14 of the stitchframe and to the portion 29 of the clamp frame, and these two parts 29and let have a relative move ment during the stitching of thebuttonhole, as above set forth. The construction of the under threadreleasing device, however, is such that it does not interfere with suchrelative movement and such that this rel-ative movement between theparts 29 and ll does not affect the operation thereof. The member 51which is connected to the stitch frame at is pivotallyconnected totherod 55, and this rod is loosely hung from the ear 58 secured to theclamp frame. Therefore, the connection between the rod 55 and the member51 and clamp frame is suiticiently flexible to permit of any relativefor ward and backward movement between the stitch frame and clamp framewithout binding or cramping the parts.

It will thus be seen that I have provided a two-thread buttonhole sewingmachine in which the under thread mechanism is mounted to turn bodilyabout an axis perpendicular to the work with meansfor automaticallyrelieving the tension on the under thread at the end of the stitchingoperation and for automatically applying the tension to the thread atthe beginning of the next stitching operation, and while I have hereinshown one particular embodiment of my invention and such embodiment asapplied to a sewing machine of the Reece type, yet I desire to statethat the invention is not confined to the constructional details shown,nor 1s 1t confined 111 its applicatlon to the particular type of sewingmachine herein illustrated,

I claim:

1. Ina buttonhole sewing machine, the combination with upper threadmechanism, of under thread mechanism mounted for bodily turning movementto provide for stitching around the end of a buttonhole, a tensiondevice for the under thread mounted for bodily turningmovementtherewith, and means for automatically actuating said tension devicethereby to release the tension on the under thread at the end of thestitching operation.

2. Ina buttonhole sewing machine, the combination with an upper threadmechanism, of under thread mechanism mounted for bodily turning movementto provide for stitching around the end of'a buttonhole, a tensiondevice for the under thread mounted for bodily turning movement with theunder thread mechanism, and means to actuate the tension deviceauton'latically thereby to release ,the tension on the under thread'atthe end of the stitching operation.

3. In a buttonhole sewing machine, the combination with upper threadmechanism, of under thread mechanism including a stitch block mountedfor turning movement and carrying stitch-forming instrumentalities, atension device for the under thread 'arried by the stitch block, andmeans for automatically actuating said tension device thereby to releasethe tension on the under thread at the end of the stitching operation.

4:. In a buttonhole sewing machine, the cdmbination with upper threadmechanism, of under thread nicchanism' mounted for bodily turningmovement and provided with a needle and an axial thread passage for theunder thread and means operating auto- 'matically to apply tension tothe portion of the under thread between said axial thread passage andthe needle at the beginning of the stitching operation on a buttonholeand to release the tension on the under thread at the end of saidstitching operation.

In a buttonhole sewing machine, the

combination with upper thread mechanism,

of under thread mechanism mounted for bodily turning movement, meanspartaking of the bodily turning movement of said under thread mechanism.to apply tension to the under thread, and means for automaticallyrendering the tension device inoperative upon the completion ofstitching operations on a buttonhole.

6. In a buttonhole sewing machine, the combination with upper threadmechanism, of under thread mechanism including a stitch block mountedfor turning movement and carrrying stitch-forminginstrumentalities,automatically-operative means carried by said stitchblock for applying tension to the under -thread,'and meansforautomatically rendering said tension means inoperative upon thecompletion of thestitching operations on a buttonhole.

7. In a buttonhole sewing machinerthe combination with work-holdingmeans, of upper thread mechanism, under thread 4 mechanism mounted forbodily turning -movement about an axis perpendicular to the plane of thework, a tension device for the under thread mounted to partake of thebodily turning movement of the under thread mechanism, and means torender said tension device inoperative upon completion of the stitchingoperation; 8. In buttonhole'sewing machine, the

combination-with work-holding means, of

upper thread mechanism, under thread mechanism mounted for bodilyturning movement about an axis perpendicular to the plane of the work, atension dev'icefor the under thread mounted for bodily turning movementwiththe under thread mech:

anism, and means torender saidtension de VlCB- noperative uponcomplet1on of the stitching operation and for permitting said tensiondevice to become operative again an axial thread passage for the under'operation on a buttonholei .upon the beginning of the next stitchingoperation.

9. In a buttonhole sewing machine, .the

o0 bination with work-holding means, of

up er thread mechanism, under thread mechanism mounted for bodilyturning movement about an axis-perpendicular 'to the plane of the work,said under thread mechanism being provided with a needle and thread, atension device situatedto' apply tension to the'portion of the threadbetween said axial passage and the needle, and means to release thetension on the thread upon the completion of the stitch ing operation onabuttonhole. 10. In a buttonhole stitching machine, the

combination with work-holding 'means, of

upper thread mechanism, under thread mechanism mounted for bodilyturning movement about an axis perpendicular to the plane of the work,a'tension device for the under thread carried by said underthreadmechanism and partaking of the bodily turning movement thereof, andmeans for actuating said tension devlce thereby to release the tensionon the under thread at the completion ofthe stitching 11. In abuttonhole sewing'machine, the combination with upper thread mechanism,of under thread mechanism mounted for bodily turning movement to provide'for stitching around the end of a buttonhole, and means mounted forbodily turning movement with said under thread mechanism to apply anincreased tension to the 7 under thread at the beginning of the stitchmgoperation.

12- In a buttonhole sewing machine, the

combination with work-clamping means including a" clampingfmembermovable to clamp and unclamp the work, of upper thread mechanism, underthread mechanism, a tension device for the under thread, and meansactuated by the movement of the clamping member when the work, isunclamped to release the tension on the under thread.

i In a buttonhole sewing machine, the combination with workclampingmeans,

comprising a clamping member movalble to clamp and unclamp the work, ofupper thread mechanism under thread mechanism, and means renderedoperative by the workclamping movement of the clamping member to applytension to the under thread and by theunclampingmovement of said memberto release the tension on the under thread. f

14; In a buttonhole sewing-machine, the combination with work-clampingmeans including a clamping member movable t0 =clamp and unclamp thework, of upper thread mechanism, underthread mechanism,

ried by the under thread mechanism, and means actuated by the unclampinmovement of said clamping member to re ease the tension onthe underthread.

15. In a buttonhole sewing machine, the combination with work-clampingmeans comprising a clamping member movable to a tension device for theunder thread carclamp and unclamp the work, of upper under thread.mechanism having a bodily turning movement in the stitch frame andsaid. stitch frame and-.clam -frame being movable relative to each oter, a tension device for theundei; thread movable with the,

stitch frame, and means actuated by the work-clamping means to rendersaid tension device inoperative upon'fthe completion of the stitchingoperation.

17. In a buttonhole sewing machine, the combination with a stitch frame,of under thread mechanismcarried thereby which is mounted thereon forbodily turning movement to provide for stitching around the end a ofthebuttonhole, a tensionv device for the v clampin under threadpartaking of said bodily turning movement, and means for automatic-allyrelieving the tension at the end combination with an upper threadmechanism and an under thread mechanism mounted for bodily turningmovement about a vertical axis, of work-clamping means, and meanssituated beneath the work-clamping means and rendered operative by theclamping movement thereof, to apply ten-- sion to the under thread.

19. In a buttonhole sewing machine, the combination with under threadmechanism mounted for bodily turning movement about an aXisperpendicular to the plane of the work, of a tension device for theunder thread mounted for bodily turning movement with the under threadmechanism, and means to render said tension device inoperative uponcompletion of the stitching operation and for permitting said tensiondevice to become operative again upon the beginning of the nextstitching operation.

20. In a buttonhole sewing machine, the combination with an. upperthread mechanism and an under thread mechanism, of work-clamping meansconstructed to hold the work clamped against movement relative theretoduring the stitching of a buttonhole and comprising a movableworkmember, a tension device for the under tiread' situated beneath theworkclamping means, and means actuated by the. unclamping movement ofthe clamping member to release the tension on the under 4 thread.

21. In a buttonhole sewing machine, the combination with an upper threadmechanism and an under thread mechanism, of work-clamping meansconstructed to hold the work clamped against movement relative theretoduringthe'stitching of a but tonhole and comprising a movableworkclamping member, automaticallyoperative means to apply tension tothe under thread, and means actuated by the unclamping movement of theclamping member to render said tension-applying means inoperative. v

22. In a buttonhole sewing machineflthe combination with an upper threadmechanism, and an under thread mechanism, of

work-clamping .means constructed to hold the work clamped againstmovement relative thereto during the stitching of a buttonhole andcomprising a movable clamping member, and means rendered operative bythe clamping movement of the clamping member to apply tension to theunder thread and bythe unclamping movement of -said clamping member torelieve said tension.

23. In a buttonhole sewing machine, the

combination with a stitch frame of under thread mechanism carriedthereby, a tension device forthe-under thread, a clamp frame,work-clamping means carried thereby, said frames having amovement-relative to each other during the stitching operation on abuttonhole and a further movement relative to eachother at thecompletion of the stitching operation to relatively move said framesfrom stitching to. buttonholecutting position, and means actuated by thework-clamping means when the work is unclamped for automaticallyreleasing the tension on the under thread at the end of the stitchingoperation and before the completime of such relative movement of theframes.

24. Ina buttonhole sewing machine, the combination with' a stitch'frameof under thread mechanism mounted thereon for bodily turning movement, atension device for the under thread, a clamp frame, workclamping meanscarried thereby, said frames hav ng a movement relative to each otherduring the stitching operation on a buttonhole and a further movementafter the com-- frames complete their relative movement.

25. In a buttonhole sewing machine, the combination with work-clmnpingmeans constructed to hold vthe w'lork clamped against movement relativethereto during the stitching of a buttonhole and comprising a movableclamping member which is brought into clamping position at the beginningof a stitching operation and is maintained 1n clamping positioncontinuouslyduring the stitching operation, of upper thread mechanism,under thread mechanism, a tension device for the under thread situatedbeneath the clamping member, and means actuated by the clamping memberto release the tension on the under thread at the end of a stitchingoperation.

26. In a buttonhole sewing machine, the combination with upper threadmechanism, of under thread mechanism mounted for bodily turning movementabout a vertical ZIXlStO provide for stitching around the end of abuttonhole, said under thread mechanism being provided with a needle andan axial threadcpassage for the under thread, work-clamping means, atension device for the 'under thread situated beneath the workclampingmeans and adapted .to act on the under thread between said axial passageand'the needle, and means for automatically actuating the tension deviceto release the tension on the under thread at the end of the stitchingoperation.

27. In a buttonhole sewing machine, the combination with work-clampingmeans, of upper thread mechanism, under thread mechanism mounted forbodily turning movement about a vertical axis and provided .With aneedle and an axial thread passage for the under th1'ead,meanssituated"be1'1eath the Work-clamping means and operatingautomaticallyto'apply tension to the portionot' the under thread extending betweensaid axial passage and the'needle at the beginning of the stitchingoperation on a buttonhole and-to release said tension at the end of saidstitching operation.

28.. A buttonhole sewing machine, having n isins, a work clanip, arotary turret: carry:

i'ng theunder thread mechanism, mechanism for relatively actuating thestitch forming mechanisnrand clamp to sew about a buttonhole; an underthread tension device sewing and to relieve the tension at thecompletion of the sewing.

In testimony whereof, I have signed my name to this specification, inthe presence 30 of two-subscribing Witnesses. v

- JOHN KIEWICZ. lVitnesses:

F. A. SHEA,

LOUIS C. SMITH.

